py/modmicropython: Allow to have stack_use() func without mem_info().

The micropython.stack_use() function is useful to query the current C stack
usage, and it's inclusion in the micropython module doesn't need to be tied
to the inclusion of mem_info()/qstr_info() because it doesn't rely on any
of the code from these functions.  So this patch introduces the config
option MICROPY_PY_MICROPYTHON_STACK_USE which can be used to independently
control the inclusion of stack_use().  By default it is enabled if
MICROPY_PY_MICROPYTHON_MEM_INFO is enabled (thus not changing any of the
existing ports).

py/modmicropython.c

@@ -103,15 +103,15 @@ STATIC mp_obj_t mp_micropython_qstr_info(size_t n_args, const mp_obj_t *args) {
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(mp_micropython_qstr_info_obj, 0, 1, mp_micropython_qstr_info);
 
-#if MICROPY_STACK_CHECK
+#endif // MICROPY_PY_MICROPYTHON_MEM_INFO
+
+#if MICROPY_PY_MICROPYTHON_STACK_USE
 STATIC mp_obj_t mp_micropython_stack_use(void) {
     return MP_OBJ_NEW_SMALL_INT(mp_stack_usage());
 }
 STATIC MP_DEFINE_CONST_FUN_OBJ_0(mp_micropython_stack_use_obj, mp_micropython_stack_use);
 #endif
 
-#endif // MICROPY_PY_MICROPYTHON_MEM_INFO
-
 #if MICROPY_ENABLE_PYSTACK
 STATIC mp_obj_t mp_micropython_pystack_use(void) {
     return MP_OBJ_NEW_SMALL_INT(mp_pystack_usage());
@@ -167,10 +167,10 @@ STATIC const mp_rom_map_elem_t mp_module_micropython_globals_table[] = {
 #endif
     { MP_ROM_QSTR(MP_QSTR_mem_info), MP_ROM_PTR(&mp_micropython_mem_info_obj) },
     { MP_ROM_QSTR(MP_QSTR_qstr_info), MP_ROM_PTR(&mp_micropython_qstr_info_obj) },
-    #if MICROPY_STACK_CHECK
+#endif
+    #if MICROPY_PY_MICROPYTHON_STACK_USE
     { MP_ROM_QSTR(MP_QSTR_stack_use), MP_ROM_PTR(&mp_micropython_stack_use_obj) },
     #endif
-#endif
 #if MICROPY_ENABLE_EMERGENCY_EXCEPTION_BUF && (MICROPY_EMERGENCY_EXCEPTION_BUF_SIZE == 0)
     { MP_ROM_QSTR(MP_QSTR_alloc_emergency_exception_buf), MP_ROM_PTR(&mp_alloc_emergency_exception_buf_obj) },
 #endif

py/mpconfig.h

@@ -907,6 +907,11 @@ typedef double mp_float_t;
 #define MICROPY_PY_MICROPYTHON_MEM_INFO (0)
 #endif
 
+// Whether to provide "micropython.stack_use" function
+#ifndef MICROPY_PY_MICROPYTHON_STACK_USE
+#define MICROPY_PY_MICROPYTHON_STACK_USE (MICROPY_PY_MICROPYTHON_MEM_INFO)
+#endif
+
 // Whether to provide "array" module. Note that large chunk of the
 // underlying code is shared with "bytearray" builtin type, so to
 // get real savings, it should be disabled too.